Program: GN-2019B-Q-116

Detailed chemical abundances of planet-hosting stars are a vital tool to our understanding of planet formation and evolution. It has been suggested that a correlation between chemical abundances and condensation temperature (Tc) might be a possible signature of planet formation and evolution (e.g., Meléndez et al. 2009, 2017). However, the detection of this signature is a challenging task that requires the highest precision in stellar abundances (<0.01 dex), which is only possible through differential analysis of binary systems with similar components. To date, only 4 binary systems with similar components, where one of the stars hosts a planet, have been studied via a strictly differential analysis. Given the possible link between planet formation and stellar composition, it is critical to increase the sample of binary systems hosting planets exposed to high-precision differential abundance analysis. In this context, from high-quality GRACES spectra, we propose to perform the first high-precision differential chemical analysis of the exceptional binary system WASP-160 A/B. Recently, a transiting Saturn-mass planet has been discovered around the secondary component WASP-160 B (Lendl et al. 2019). A few short observations will allow us to test the signature of planet formation in this system and to provide constraints on close-in giant planet formation and evolution. Moreover, the high-quality spectra will permit us to obtain improved stellar parameters that will be key for the future atmospheric characterization of the detected short-period inflated planet WASP-160B b.